If your ESC doesn’t have a BEC built in, then you need a UBEC to power your receiver.
The Oset brand magnetic switch I am using comes from a 48 volt bike. So I assumed it would be suitable, considering the small current draw from the receiver.

Hi
I à bec to my contrôler to connect thé receiver
My contrôller has a poser switch
But i dont Know how connect dead man After my Waterproof breaker
Dead man has only small wires and i m not sure it s support batteries intensity !
Do i change wires and connectors ?
Havé you a réally picture With exemple connexion ?
Regards
Giloris

@g.gregory8 my magnetic switch is going to be connected to my UBEC which powers the receiver. I’m not sure if this is the correct method, I was hoping for suggestions from other builders too.@giloris I don’t have pictures as I’m still in the planning stages too.

What does your ESC do if you unplug your receiver?
Your BEC-Killer does only kill the receiver, not the motor nor the ESC.
So if fail-safe at ESC does not turn off motor this will not work.
Better and clean solution is anti-spark-switch: e.g. this one
which specific you use is depended on your motor-battery combo. If you run more than 60V you have to watch out and depending on the amps you want to drive your motor with, you might need multible fets.

Has anyone used/tested a circuit breaker (CB) such as this? I had a thought to use this circuit breaker also as a switchable dis-connect. I.e I will trigger the circuit breaker test button with a servo to break the circuit and also use the same servo to reset it.

The intention is to simulate having a contactor, until I find a suitable contactor solution. I have a teensy in the loop controlling the ESC speed, so this can also control the servo to trip and reset the CB. If the lanyard is pulled then I will trip the CB. Obviously this isn’t super reliable adding a servo into the loop.

I haven’t actually tested this circuit breaker yet, just trialled the trip / reset with a servo.

For 3000A@48v interrupt capability those are quite cheap, good find. I wonder how they work internally and how much power loss occurs at 100A.
For the servo idea, I like it but that would be to much mechanical stuff to figure out for me. Maybe if you open it up, a way to acuate it electricaly could be found. Edit: Like @MaxMaker says below, there is only a bimetal sheet inside. I found a video teardown. Does not look confidence inspiron to me.

I looked at them. Very cheap. Some say „waterproof“ but I don’t see how they can be. Inside are two metal plates that deflect to create contact. Clever mechanism, but not very accurate and prone to errors due to cheap manufacturing. Check out some videos on Youtube. They break all the time.

Quick one : is carbon fiber an electricity conductor, and if yes, then should we be really using it ? Same for cooling aluminium plate to cool down the esc (that said I love carbon fiber looking and aluminium plate cooler idea )

Yes they are, but its not just about weather they are conducting. It is more about where they are conducting too. The current wants to flow from positive to negative, so it needs a circuit to do that. Hopefully your finger is not part of the circuit. If your heart is part of the circuit, that could be deadly.